Watch the Incredible Video of the Lassen Peak Eruption in 1914

Lassen Peak erupted from 1914-1917, an incredible event that was documented by local photographer J.B. Loomis

My interest with our surrounding volcanic activity has turned from curiosity to obsession. The last eruption of Mount Shasta occurred in 1786, making it nearly impossible for the people of that time to document the violence and significance of the eruption. But with Lassen Peak erupting a little over 100 years ago, we have had primitive photography that documented the rare event, leaving little to the imagination.

As we were looking for more information regarding the Lassen eruption, I came across some video that actually shows the eruption. Obviously, this video is far from HD, but it does show this historic event in action. You can see the footage 35 seconds in to the video below:

This is incredible video of what turned out to be a significant eruption. The before and after photos of the volcano show you how the eruption altered the appearance of Lassen Peak. Here is a photo of the it before the 1914 eruption:

And this is what it has looked like ever since:

You can see a whole side of the mountain was lost during the blast. We’ve covered the the Lassen eruption at length in the past. Here is an excerpt from an article done by Chip O’Brien about the Lassen Peak eruption:

The following description is paraphrased from the USGS document A Sight Fearfully Grand ”Eruptions of Lassen Peak, California, 1914 to 1917 By Michael A. Clynne, Robert L. Christiansen, Peter H. Stauffer, James W. Hendley:

Lassen first showed signs of coming to life on May 30th, 1914 with steam explosions near the summit. These continued for almost a year, more than 180 releases in all, expanding the summit crater by 1,000 feet. On the evening of May 15th, 1915, the first lava was sighted spilling down the flanks of the volcano and filling in the summit crater. A few days later on May 19th another explosion created a new summit crater. There was still 30 feet of snow at the summit, and the hot rocks created a half-mile-wide avalanche that spilled down the side of the volcano and into Hat Creek four miles away.

As the snow in the avalanche melted it mixed with volcanic materials to form a mudflow called a lahar. This then raced down Lost Creek canyon for another seven miles. Hat Creek Valley was flooded with muddy water on May 20th, which damaged several ranches in the Old Station area. Floodwaters headed down Hat Creek to the Pit River, over 30 miles, and witnesses claimed the muddy waters killed many fish. Of course, there were salmon and steelhead in all these waters back then. More lava spilled from the summit on the 19th and 20th reaching down the mountainous flank another 1,000 feet.

The next powerful explosion happened around 4:00pm on May 22nd blowing rocks high into the air above the summit. Shortly thereafter a column of volcanic ash and gas rose some 30,000 feet above the mountain, which was visible from 150 miles away. A pyroclastic flow, an angry burst of hot gas and rock blasted down Lassen’s flank at up to 450 miles per hour and 1,000 degrees clearing three square miles of virtually everything in its path.

Another mudflow (lahar) was generated by the pyroclastic flow that again blew 15 miles down Lost Creek and releasing another blast of muddy water down Hat Creek. Volcanic ash flowed down the mountain and fine volcanic ash blew in a northeasterly direction as far away as Elko, Nevada. Smaller eruptions continued between 1914 and 1917, and steam continued to leak from the calming volcano well into the 1920s.

Today the science of volcanic eruption prediction is far more advanced than it was in the dawn of the 1900s, but it is far from foolproof either. Most volcanoes “announce” their pending activity as long as years in advance to only a matter of days. Fortunately the prevailing winds typically blow from West to East in NorCal, so volcanic ash from another eruption would most likely be blown away from major population centers along the I-5 corridor.

This, however, is no reason to get too comfortable. There are too many ways future eruptions could cause catastrophic problems for North State residents and visitors, not to mention traffic on I-5 and even airline routes worldwide.

Active NorCal

Telling the Stories of Northern California


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  8. My grandmother lived in the family home in Sierra City, California during the Lassen eruption and told of the entire town being covered with a layer of ash.

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